Smart Calculator
M+ add to memory
M- subtract from memory
MC clear memory
MR recall from memory

Equation display
Result display

Percent Calculation
Input % for calculation, e.g 7%
Enter number, e.g. 500, number displays in equation text field.
Tap M+ to store number (500) in memory.
Tap % button, the result text field displays 35.

Tap AC button to clear the equation (0) and the result (0) text fields.
Tap MR button, number store in memory display in equation (500) text field.
Tap +% button, the result text field displays 535.

Tap AC button to clear the equation (0) and the result (0) text fields.
Tap MR button, number store in memory display in equation (500) text field.
Tap -% button, the result text field displays 465.

Tap AC button to clear the equation (0) and the result (0) text fields.
Tap MR button, number store in memory display in equation (500) text field.
Tap -vat button, the result text field displays 467.29.

Tap AC button to clear the equation (0) and the result (0) text fields.
Tap MR button, number store in memory display in equation (500) text field.
Tap 50% button, the result text field displays 250.

General purpose to compute percent Sales Profit Loss and Discount.

Equation evaluation:
enter: 3x(4+5)-8/2 then tap = button.
result displays: 23
equation displays: 3x(4+5)-8/2 = 23
tap = button, the result moves to equation 23 = 23 for further calculation.